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Kepler-27

Coordinates:Sky map19h 28m 56.825s, +41° 05′ 09.15″
From Wikipedia, the free encyclopedia
G-type star in the constellation Cygnus
Kepler-27
Observation data
Epoch J2000      Equinox J2000
ConstellationCygnus[1]
Right ascension19h 28m 56.81962s[2]
Declination+41° 05′ 09.1405″[2]
Apparent magnitude (V)15.855[3]
Characteristics
Evolutionary stagesubgiant[2]
Spectral typeK2 III-IV[4]
Astrometry
Proper motion (μ)RA: 2.171±0.033mas/yr[2]
Dec.: −0.324±0.031mas/yr[2]
Parallax (π)0.9298±0.0281 mas[2]
Distance3,500 ± 100 ly
(1,080 ± 30 pc)
Details
Mass0.9+0.03
−0.10[5] M☉
Radius0.850+0.017
−0.016[6] R☉
Luminosity0.45[7] L☉
Surface gravity (log g)4.58[7] cgs
Temperature5,249+68
−56[6] K
Metallicity[Fe/H]0.250+0.064
−0.061[6] dex
Rotation14.7 days[8]
Rotational velocity (v sin i)0.6±5.0[9] km/s
Age1.620+0.978
−0.466[6] Gyr
Other designations
KOI-841,KIC 5792202,2MASS J19285682+4105091, Gaia DR2 2053586321364864640
Database references
SIMBADdata
Exoplanet Archivedata
KICdata

Kepler-27 is astar in the northernconstellation ofCygnus, the swan. It is located at thecelestial coordinates: Right Ascension19h 28m 56.81962s, Declination +41° 05′ 09.1405″.[2] With anapparent visual magnitude of 15.855,[3] this star is too faint to be seen with the naked eye. In 2024, Kepler-27 was discovered to be abinary star with ared dwarf companion 1.975arcseconds away.[10]

Planetary system

[edit]

The planetary system of Kepler-27 comprising two small gas giants on eccentric orbits[5] was discovered in late 2011.[9] The planetsKepler-27b andKepler-27c haveequilibrium temperatures of 610K and 481K, respectively.[11] In 2021, a third, sub-Neptune-sized planet was confirmed, orbiting closer in than the other two planets.[12][13]

The Kepler-27 planetary system[11][13]
Companion
(in order from star)		MassSemimajor axis
(AU)		Orbital period
(days)		EccentricityInclinationRadius
d——6.54629——0.2414 RJ
b0.1320±0.018 MJ0.11815.3348——0.522±0.024 RJ
c0.0670±0.011 MJ0.19131.3309——0.640±0.029 RJ

References

[edit]
  1. ^Roman, Nancy G. (1987)."Identification of a constellation from a position".Publications of the Astronomical Society of the Pacific.99 (617): 695.Bibcode:1987PASP...99..695R.doi:10.1086/132034. Constellation record for this object atVizieR.
  2. ^abcdefVallenari, A.; et al. (Gaia collaboration) (2023)."Gaia Data Release 3. Summary of the content and survey properties".Astronomy and Astrophysics.674: A1.arXiv:2208.00211.Bibcode:2023A&A...674A...1G.doi:10.1051/0004-6361/202243940.S2CID 244398875. Gaia DR3 record for this source atVizieR.
  3. ^abKepler-27b,NASA Ames Research Center, archived fromthe original on 2012-05-03, retrieved2011-12-06
  4. ^Gray, R. O.; Corbally, C. J.; De Cat, P.; Fu, J. N.; Ren, A. B.; Shi, J. R.; Luo, A. L.; Zhang, H. T.; Wu, Y.; Cao, Z.; Li, G.; Zhang, Y.; Hou, Y.; Wang, Y. (2016)."LAMOST Observations in the Kepler Field: Spectral Classification with the MKCLASS Code".The Astronomical Journal.151 (1): 13.Bibcode:2016AJ....151...13G.doi:10.3847/0004-6256/151/1/13.
  5. ^abHadden, Sam; Lithwick, Yoram (2017), "Kepler Planet Masses and Eccentricities from TTV Analysis",The Astronomical Journal,154 (1): 5,arXiv:1611.03516,Bibcode:2017AJ....154....5H,doi:10.3847/1538-3881/aa71ef,S2CID 118936786
  6. ^abcdMorton, Timothy D.; Bryson, Stephen T.; Coughlin, Jeffrey L.; et al. (2016)."False Positive Probabilities for all Kepler Objects of Interest: 1284 Newly Validated Planets and 428 Likely False Positives".The Astrophysical Journal.822 (2): 15.arXiv:1605.02825.Bibcode:2016ApJ...822...86M.doi:10.3847/0004-637X/822/2/86. 86.
  7. ^abMathur, Savita; Claytor, Zachary R.; Santos, Ângela R. G.; García, Rafael A.; Amard, Louis; Bugnet, Lisa; Corsaro, Enrico; Bonanno, Alfio; Breton, Sylvain N.; Godoy-Rivera, Diego; Pinsonneault, Marc H.; Van Saders, Jennifer (2023)."Magnetic Activity Evolution of Solar-like Stars. I. Sph-Age Relation Derived from Kepler Observations".The Astrophysical Journal.952 (2): 131.arXiv:2306.11657.Bibcode:2023ApJ...952..131M.doi:10.3847/1538-4357/acd118.
  8. ^Lu, Yuxi(Lucy); Angus, Ruth; Foreman-Mackey, Daniel; Hattori, Soichiro (2024)."In This Day and Age: An Empirical Gyrochronology Relation for Partially and Fully Convective Single Field Stars".The Astronomical Journal.167 (4): 159.arXiv:2310.14990.Bibcode:2024AJ....167..159L.doi:10.3847/1538-3881/ad28b9.
  9. ^abSteffen, Jason H.; Fabrycky, Daniel C.; Ford, Eric B.; Carter, Joshua A.; Desert, Jean-Michel; Fressin, Francois; Holman, Matthew J.; Lissauer, Jack J.; Moorhead, Althea V.; Rowe, Jason F.; Ragozzine, Darin; Welsh, William F.; Batalha, Natalie M.; Borucki, William J.; Buchhave, Lars A.; Bryson, Steve; Caldwell, Douglas A.; Charbonneau, David; Ciardi, David R.; Cochran, William D.; Endl, Michael; Everett, Mark E.; Gautier III, Thomas N.; Gilliland, Ron L.; Girouard, Forrest R.; Jenkins, Jon M.; Horch, Elliott; Howell, Steve B.; Isaacson, Howard; et al. (2012), "Transit Timing Observations from Kepler: III. Confirmation of 4 Multiple Planet Systems by a Fourier-Domain Study of Anti-correlated Transit Timing Variations",Monthly Notices of the Royal Astronomical Society,421 (3): 2342,arXiv:1201.5412,Bibcode:2012MNRAS.421.2342S,doi:10.1111/j.1365-2966.2012.20467.x,S2CID 11898578
  10. ^Sullivan, Kendall; Kraus, Adam L.; Berger, Travis A.; et al. (2024)."Revising Properties of Planet–Host Binary Systems. IV. The Radius Distribution of Small Planets in Binary Star Systems Is Dependent on Stellar Separation".The Astronomical Journal.168 (3): 14.arXiv:2406.17648.Bibcode:2024AJ....168..129S.doi:10.3847/1538-3881/ad6310. 129.
  11. ^abFurlan, E.; Howell, S. B. (2017), "The Densities of Planets in Multiple Stellar Systems",The Astronomical Journal,154 (2): 66,arXiv:1707.01942,Bibcode:2017AJ....154...66F,doi:10.3847/1538-3881/aa7b70,S2CID 28833730
  12. ^Valizadegan, Hamed; Martinho, Miguel J. S. (February 2022)."ExoMiner: A Highly Accurate and Explainable Deep Learning Classifier That Validates 301 New Exoplanets".The Astrophysical Journal.926 (2): 120.arXiv:2111.10009.Bibcode:2022ApJ...926..120V.doi:10.3847/1538-4357/ac4399.S2CID 244954905.
  13. ^ab"Kepler-27".NASA Exoplanet Archive. Retrieved7 November 2022.
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